SB2026052897 - Improper control of a resource through its lifetime in Linux kernel ext4

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Main Vulnerability Database SB2026052897

SB2026052897 - Improper control of a resource through its lifetime in Linux kernel ext4

Published: May 28, 2026

Security Bulletin ID SB2026052897
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-45985)

CWE-ID: CWE-664 - Improper control of a resource through its lifetime

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to improper extent state handling in ext4_split_convert_extents() when allocating blocks during within-EOF direct I/O and writeback with dioread_nolock enabled. A local user can trigger a failed direct I/O write that splits an unwritten extent to disclose sensitive information.

The issue can occur when a temporary ENOSPC condition happens during extent splitting, causing inconsistency between the on-disk extent state and the extent status tree.


Remediation

Install update from vendor's website.

References